Revert trial commit of "CssStyleDeclaration performance work"

tools/dom/templates/html/impl/impl_CSSStyleDeclaration.darttemplate

Index: tools/dom/templates/html/impl/impl_CSSStyleDeclaration.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_CSSStyleDeclaration.darttemplate b/tools/dom/templates/html/impl/impl_CSSStyleDeclaration.darttemplate
index c1b2ab28e6351bc550dd20b056d4d6dbd6c89e8f..1b47c7dc69dddd0a34c678ead2b1ef50ebd90735 100644
--- a/tools/dom/templates/html/impl/impl_CSSStyleDeclaration.darttemplate
+++ b/tools/dom/templates/html/impl/impl_CSSStyleDeclaration.darttemplate
@@ -67,34 +67,14 @@ $endif
 
   @DomName('CSSStyleDeclaration.setProperty')
   void setProperty(String propertyName, String value, [String priority]) {
-    return _setPropertyHelper(_browserPropertyName(propertyName),
-      value, priority);
-  }
-
-  String _browserPropertyName(String propertyName) {
-    String name = _readCache(propertyName);
-    if (name is String) return name;
     if (_supportsProperty(_camelCase(propertyName))) {
-      name = propertyName;
+      return _setPropertyHelper(propertyName, value, priority);
     } else {
-      name = Device.cssPrefix + propertyName;
+      return _setPropertyHelper(Device.cssPrefix + propertyName, value,
+          priority);
     }
-    _writeCache(propertyName, name);
-    return name;
   }
 
-$if DART2JS
-  static final _propertyCache = JS('', '{}');
-  static String _readCache(String key) =>
-    JS('String|Null', '#[#]', _propertyCache, key);
-  static void _writeCache(String key, String value) {
-    JS('void', '#[#] = #', _propertyCache, key, value);
-  }
-$else
-  static String _readCache(String key) => null;
-  static void _writeCache(String key, value) {}
-$endif
-
   static String _camelCase(String hyphenated) {
 $if DART2JS
     var replacedMs = JS('String', r'#.replace(/^-ms-/, "ms-")', hyphenated);
@@ -112,9 +92,18 @@ $endif
 
 $if DART2JS
   void _setPropertyHelper(String propertyName, String value, [String priority]) {
-    if (value == null) value = '';
-    if (priority == null) priority = '';
-    JS('void', '#.setProperty(#, #, #)', this, propertyName, value, priority);
+    // try/catch for IE9 which throws on unsupported values.
+    try {
+      if (value == null) value = '';
+      if (priority == null) {
+        priority = '';
+      }
+      JS('void', '#.setProperty(#, #, #)', this, propertyName, value, priority);
+      // Bug #2772, IE9 requires a poke to actually apply the value.
+      if (JS('bool', '!!#.setAttribute', this)) {
+        JS('void', '#.setAttribute(#, #)', this, propertyName, value);
+      }
+    } catch (e) {}
   }
 
   /**